Produção de mudas de alface sob malhas fotosseletivas

Abstract

Lettuce is one of the leafy vegetables that are most part of Brazilian population diet, having an important presence in the national market. In trade, standards are required for quality, quantity and mainly supply regularity. Seedling vegetable production phase has a direct influence on the final harvest, both in its production and in relation to the nutritional value. Many aspects are considered important in seedlings production, for example cultivation in protected environments, which can be covered with shading or other cover types, which produce changes in the environment microclimate. Therefore, the objective of this work was to verify if photosselective shading nets can improve lettuce seedlings production. The experiment was carried out in a randomized block design with five treatments, consisting of shading nets: black 60%, black 50%, green 60%, red 35%, and the control (without nets), with five replications, forming a total of 25 plots. They were evaluated at seven, 14, 21 and 28 days after sowing: seedling emergence percentage; velocity emergence index, number of leaves and plant height, and at 28 DAS root length, root and shoot plant dry mass. The results were submitted to analysis of variance and comparison of means by Tukey's test (p <0.05). In the conditions under which this research was carried out, it is possible to conclude that: the green net with 60% shading has a negative effect in lettuce percentage and speed emergence index; from 14 DAS the black mesh with 50% of shading propitiates increase in leaves number and lettuce seedlings height; the nets used do not interfere with the root length of lettuce seedlings